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The number of solid spheres each of diameter 6 cm that could be moulded to form a solid metal cylinder 4 cm, is?

3
4
5
6

Correct Answer: 5

Explanation:

Let the number of spheres be N
Then, N x 4/3 π x (3)³ = π x (2)² x 45
⇒ 36N = 180
∴ N = 180/36 = 5

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